Two friends walked through the vast desert. The scorching sun beat down on the golden dunes.

They argued, and one friend slapped the other. The hurt friend wrote in the sand, 'Today my best friend slapped me in the face.'

The other friend said, 'When someone hurts us, we write it in sand, but when someone does something good, we engrave it in stone.'

At an oasis, the slapped friend nearly drowned but was saved. He wrote, 'Today my best friend saved my life.'

The friend who saved him asked, 'After I hurt you, you wrote in the sand, now you write on a stone. Why?'